I beg to differ about the location of the surrounds in the rear, rather than sideways. At least for music, I believe it is very difficult for the ear to link whats happening in the front seamlessly to the rear. Since 5.1 is around, pretty much every article I read recommended them at the side, not rear.
If you have them at the side and play Mahler's 9th Symphony with the Mahler Youth Orchestra (DTS 5.1), http://www.amazon.com/Mahler-Symphon...5638137&sr=1-1
you will have a soundstage that is 160 degrees wide and lays the orchestra out in front of you as if you were a foot or two behind the conductor.
It is the best surround recording I know, and even if you hate Mahler or classical music, it's well worth listening to to really see how a good surround recording can sound.
I don't think you will hear it like that with the surrounds in the rear.
Jeff Beck at Ronnie Scott's (BR) is well recorded, also Dave Matthews and Tim Reynolds at Radio City Hall (BR)
My movies sound fine, too. Although I have a 7.1 set-up, many tracks are 5.1 and that's how I play them (Pure Audio).
Good movies are the Master and Commander, where the first few minutes should give you the feeling that you are on that ship, with noises coming from everywhere.
For explosions etc. 2012 is right up there for effects.
But even football games on CBS and Fox come now with 5.1 surround and make the games more lifelike.
So move them to the sides and see what happens. You can always move them back if you don't hear a difference.